Virus-like capsids within axons. (A) Tomogram slices with axonal vaults. Cartoons depict vault protein wall in brown and membranes in blue. (B) Example intact virus-like capsids inside axons. Cartoons show compartment wall in brown and internal densities in pink. (C) Comparison of diameters from intact (27.3 ± 2.0 nm, n = 31), open (29.8 ± 5.1 nm, n = 18) virus-like capsid or those within an ILV (24.4 ± 3.0 nm, n = 4). *, P = 0.0186 for intact versus open, P = 0.0136 for intact versus ILV, or P = 0.0574 for open versus ILV, unpaired two-tailed t test. Error bars shows mean and SD. (D) Tomogram slices and cartoons of open virus-like capsids. Coloring as in B. (E) Tomogram slices and cartoons of a virus-like capsid within an ILV of an MVB. Cartoon is colored as in B, with endosome lumen in light blue and ILV lumen in gray.